Process for producing 4-ketones of the quinolin series.



UNITED STATES PATEN OFFICE,

ADOLF KAUFMANN, OF GENEVA, SWITZERLAND.

No Drawing.

which have the general constitutional for mula l l G wherein R stands for a hydrocarbon residue. The new monoketones are oils or substances of a low melting point, which are very slightly volatile in steam. They are characterized as ketones by the' fact that they form well crystallizing hydrazones, dissolving in acids with a characteristic orange red color. These ketones are intended to be used as startingefsubstances for manufacturing therapeutically valuable products.

The following examples will illustrate my invention, the parts being by weight:

, Example I: One part of rcyanquinolin (see Bem'ckte vol. 44, 1911, page 2062) is dissolved in benzene, and to this are then carefully added, while stirring. two parts of methyl magnesium iodid, after which the mixture is kept boiling on a reflux condenser 'on the water bath for half an hour.

The solid granular precipitate thus obtained is then treated with ice water and ammonium chlorid'and the ketone produced is separated I by the aid of benzene. From the benzeneextract gaseous, dry hydrochloric acid will precipitate the hydrochlorld of the new ketone in the form of'a white crystalline powder. The quinolylt-methylketone separated from the salt as an oil is dried and subjected to a distilling process, preferably at a greatly reduced pressure. It boils at a pressure of 0.2 mm. at about 1Q6 (not corrected) and meltsbelow 20 it is very slightly volatile in steam, and 1s soluble 1n organic solvents. The picrate of the ketone forms bundles of needles which decompo e Specification of Letters Patent.

Application filed May 1,1913. Serial No. 764,952.

PRocEss ron PRODUCING a-xn'ronns or THE QUINOLIN seams.

Patented July 6, 1915.

when heated to 165-170 C. The-hydrochlorid forms colorless prisms from alcohol and decomposes at 200215 C. The iodomethylate forms dark red crystals melting at'172 (lg the hydrazone produced with phenylhydrazin forms a yellowish powder.

Example II: 10 grams of l-cyanquinolin dissolved in ether or equivalent solvent are gradually treated with a solution of 23.6 grams of a phenyl-magnesium-bromid in ether-solution, and after heating for one hour on a water-bath, the liquid is decomposed with ice-water and ammonia chlorid.

The ether and benzene are then driven olf by means of steam, and the distillation is continued until no more diphenyl passes over, the viscid, sticky mass in the distilling vessel sodium sulfate, and thereupon the hydrochlorid of the ketone is precipitated by dry hydrochloric acid. By crystallization from alcohol or water the hydrochlorid isrecovis mixed with ether, the solution dried with ered in the form of white flakes, melting at 20l (J. The quinolyl-t-phenylketone separated from the salt distils without decomposition at a pressure of about 0.12 mm. at 145 C. It is very readily soluble in alcohol, ether and benzene. brownish-yellow flakes melting at 214 C.; thehenyl-hydrazone a yellow crystalline pow er-melting at 239-240 C.. I

Example III: Two and one-half parts of The picrate forms methyl magnesium iodid dissolved in ether are added to one part of ti-methylA-cyauquinolin (see Berz'chte, vol. 45, p. 1807) which is held in solution in hot anisol. A yellowish precipitate is formed, and after boiling for a short time it is decomposed with water,

ammonium chlorid added, and the unchanged anisol driven off with steam.. A viscid oil remains, which on cooling solidifies; it constitutes thenew 6-methoxy quino'- lvl-et-methyl-ketone which crystallizes from ligroin in the form of yellow needles melt-- ing at 92 C.

I claim:

1. As new products, the monoketones con taining the radical linked by the atom group CO to a hydrocarbon radical, these new compounds-being 0115 V or solid compounds of a low melting point, soluble ill-alcohol, ether and benzene; forming crystalline. salts with hydrochloric acid and picric acid and. yielding with phenylhy- .dlazin hydrazones'. I

2. The process of manufacturing quinolylt-ketones, which consists in treating 4- cyanquinolin with an alkyl-magnesium halid solution, and decomposing by means of water the addition products thus obtained.

3. The process of manufacturing 6-a1kyl oxyquinoly1-4-methylketones, which consists in treating 6-alkyloxyi-cyanquinolin with magnesilnn-methyliodid, and dec'omnosing masses? by means of water the addition product-s -magnesium-methy1-10 id, and decomposing by means of Water the addition product thus obtained.

In'testimony whereof I aflix my signature in presence of two witnesses.

. DR. ADOLF KAUFMANN Witnesses:

" FRANCIS B. KEENE, LOUIs H. MUNICRY. 

